|A component of Microsoft Windows|
|Included with||Windows 3.0 up to Windows 7, Windows 10|
|FreeCell, Hearts, Spider Solitaire|
Solitaire, also known as Microsoft Solitaire (including in the About box in some versions), is a computer game included with Microsoft Windows, based on a card game of the same name, also known as Klondike.
Microsoft has included the game as part of the Windows operating system since Windows 3.0, starting from 1990. The game was developed in 1989 by then intern Wes Cherry, who famously received no royalties from his work. The card deck itself was designed by Macintosh pioneer Susan Kare. 
Microsoft intended Windows Solitaire "to soothe people intimidated by the operating system", and at a time where many users were still unfamiliar with graphical user interfaces, it proved useful in familiarizing them with the use of a mouse, such as the drag-and-drop technique required for moving cards.
Lost business productivity by employees playing Solitaire has become a common concern since it became standard on Microsoft Windows. In 2006, a New York City worker was fired after Mayor Michael Bloomberg saw the Solitaire game on the man's office computer.
Microsoft Solitaire celebrated its 25th anniversary on May 18, 2015. To celebrate this event, Microsoft hosted a Solitaire tournament on the Microsoft campus and broadcast the main event on Twitch.
Since Windows 3.0, Solitaire allows selecting the design on the back of the cards, choosing whether one or three cards are drawn from the deck at a time, switching between Vegas scoring and Standard scoring, and disabling scoring entirely. The game can also be timed for additional points if the game is won. There is a cheat that will allow drawing one card at a time when 'draw three' is set.
In Windows 2000 and later versions of Solitaire, right-clicking on open spaces automatically moves available cards to the four foundations in the upper right-hand corner, as in Freecell. If the mouse pointer is on a card, a right click will move only that card to its foundation, provided that it is a possible move. Left double-clicking will also move the card to the proper foundation.
Until the Windows XP version, the card backs were the original works designed by Susan Kare, and many were animated.
The Windows Vista and Windows 7 versions of the game save statistics on the number and percentage of games won, and allow users to save incomplete games and to choose cards with different face styles.
There is a limited number of shuffles; Perhaps as few as 100 with around a 66% chance of losing.
Solitaire is not included in the Windows 8 operating system. However, the Microsoft Solitaire Collection can be downloaded for free from the Windows Store, which includes original Solitaire (Klondike) plus 4 other solitaire games.
- "General Protection Fault When Starting Microsoft Solitaire". Support.microsoft.com. 2013-10-26. Retrieved 2014-08-22.
- Josh Levin: Solitaire-y Confinement: Why we can't stop playing a computerized card game. - Slate.com, May 16, 2008
- "Interview with Wes Cherry - B3TA.com 2008". B3ta.com. Retrieved 2014-08-22.
- "Susan Kare personal website showing her design for Microsoft Solitare". Kare.com. Retrieved 2014-08-22.
- "Quarterly Business Report: Do Computers Really Save Money?". Time. October 12, 1998. Retrieved May 23, 2010.
- Solitaire Costs Man His City Job After Bloomberg Sees Computer - New York Times
- "Celebrating Microsoft Solitaire". Windows Blog. May 18, 2015. Retrieved May 20, 2015.
- Solitaire at MobyGames
- Microsoft Solitaire Collection at Windows.com
- Kortspil at DMOZ
- Official Facebook page